102.14 Hair Theory

2. Only the cells of the hair ____ are alive.
4. The upper layer of skin, technically referred to as the _____ layer of the epidermis.
8. The germinal ______ is the area of the bulb where cell division (mitosis) takes place.
10. The second layer of the hair shaft, consisting of unique protein structures; gives hair most of its pigment and strength—-elasticity.
11. Tube-like “pocket” called the root sheath, out of which the hair will grow.
13. The outer covering of the hair shaft, made up of overlapping layers of transparent scales.
14. The muscle that causes the hair to stand on end when a person is scared or cold is called the arrector ____.
18. Sebum mixed with the body’s perspiration to form the acid ______.
22. A process whereby cells change their shape, dry out and form keratin protein.
23. A brief transitional stage, when all cell division stops.
24. The _________ glands, or oil glands, produce sebum (oil) and send it up through the follicles to the surface of the skin to prevent the hair and skin from becoming too dry.
25. The hair is made up primarily of _______.

1. The central core of the hair shaft, also called the pith or marrow; often absent in fine or very fine hair.
3. The technical name for eyelashes.
5. The hair fiber, sometimes referred to as the hair _____ or strand.
6. The main purposes of hair are adornment and __________.
7. The three factors that affect the behavior of the hair are ________, environment or weather and products or appliances.
9. The portion of the hair that is inside the hair follicle under the skin’s surface.
12. A condition resulting in a total lack of pigmentation in the hair and skin.
13. The papilla is filled with ___________ (small blood vessels) that supply nourishment to the cells around it, called germinal matrix cells.
15. A pigment called _______ gives skin and hair their color.
16. At the base of the hair follicle is a large structure called the papilla.
17. The technical name for the hair of the eyebrows.
19. The active growing stage, during which each hair bulb has an attached root sheath.
20. The resting stage, when each hair bulb has no attached root sheath.
21. The _____ of the hair follicle determines the natural flow or wave pattern of the hair.
24. The _____ of the follicle will determine the shape of the hair shat as it grows from the follicle.
26. The study of hair.